Crank-shaft-twisting machine



Aug. 14, 1928.

M. H. DAMERELL CRANK SHAFT TWISTING MACHINE 4 Sheets- Sheet 1 Filed March 1926 A War/ '1 Ianwe Aug. 14, 1928.

M. H. DAMERELL CRANK SHAFT TWISTING MACHINE 4 Sheets-8% 2 Filed March 10, 1925 Aug. 14, 19 28.

M. DAMERELL CRANK SHAFT TWISTING MACHINE QM &

e h S Filed March 10, 1.926

2 mm \N f/ L .Q I

M. H. DAMERELL CRANK SHAFT TWISTING MACHINE Aug. 14, 1928.

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Patented Aug. 14, 1928.

UNITED BATE-N171 cert-cs,

mm: m, DAKERELL; omwqnenamm MAssAcHUsnm'rs, ASSIGNOR.1TO-.WYMA.NFGOE non oomm on. wow-$121111; mssacnvsmrs, A. CQBBORATION or ,massacnm SETTS.

cnmxesmmrmwxsrmei MACHINE.

Applicationfild March 10, 1926; Serial. No; 93,741.-

This invention relates to" a; machinefor, bending the cranks of: a multithrow crank shaft after the forging operation Many such crank shafts aref'orged" with. all of the crank-pins and; bearings'disposed. in. asingle plane, the different. cranks being-thereafter twisted on their crank pins or'bearingsfto; the desired angular relation:

Machines have been heretofore" devised" "for performing this bending or twisting'mperation, one such machine being shown in my.

prior Patent No. l',2 7 l,39'0; issued" August- 6; 191-8.

It is the general object of myinventi'on to provide an improvedg machine for'such pub poses,which. is relativelysimple and economicalin construction and which is'rapid and efficient in operation. p p

A further object of my invention is, to build a machine whiclrisquicklj and easily adaptable to crank shafts of different sizes and designs, and'in which the .dies areof simp1econstruction andeasily manufactured;

My invention tunther relates to arrangements andeombinations ofpart's which, will be hereinafter described, and more particu larlypointed out imth'e appended claims;

A preferred form of the invention is shown in the drawings in which Fig. 1 is a front elevation. of my improved machine;

Fig; 2 is an end view, looking in the direction, ofthe arrow 21in Fig.1;

Fig. 3Iis a sectionalv endelevation taken along the line Fig, 1;

Figs. 4 and 5 anevijews similar to,'Fig. 3 but showing the -parts indifferent successive positions; l

Fig 6, is. a partial;sectionalfelevation, taken along the-line (JP-Gin Fig. 1; i

7 is, a. view similar to Kg. 6; but showing. the cnank shafti aft r th w g operation; a

Fig. 8 is an enlargediside elevation. ofone of the twisting diesglooking-in the direction of the arrow 8, in'Fig. 1;. p a

Fig. 9 is; a planzview of the parts shown inFig.8;and

10 is.v enlarged. deta-ilfview of a latch construction to he described p 7 Referring to? the drawings I have shown my: improved crank shafflitwisting machine ascomprisinga heavyhase 20 WllICh may be secured to a suitable foundation," and" an actuatinghead 21 which may be moved and guided vertically by ahydraulic pressoranyother suitable actuatingmechanism (not Thecranksh'aft Stobetwisted preferably has its end portions. located in. supportingblocks 22 and 23"(Fig 1*) and is'supporteds with thecrank pins and bearings disposedin a vertical plane between liold'ing dies Z hand 25(Fig,4:).- p

Cam bars 26 are secured 'to. the actuating head" 21. and are forced between rolls 27. and. 28' as the head descends. is'fixed-to the base QOand'each roll28 is mounted on. a sliding'bliacketj 29, supporting one of the holding dies24'or 25'; Tension springs 30, are providedforopening the d Each roll 27.1 i

asthe cam bars26 are withdrawn upwardly,

after the twistingoperation.

Reference to Fig.4will showthat the cam bars 26. areso shapedattheir lower ends that the holdingdieswill be forcedstrongly to the position indicated: in Fig.6 as soon asgthe actuatinghead begins its downward movement. The crank shaftSfis thus firmly grippedandsupported during the twistmg operation and is releasedfor'convenint removal" and replacement as soon as. the

twisting operation is completed.

I'also provide die blocks 31 and- 32 (Figs.

of thec crank pins andaccurately determine the final position of the crank pins as they are twisted by the movable upper. dies.

I will, now descnibe. the upper or twisting dies and their methodpfoperation, Three such. dies are showniinthe drawings, one for each ofthe end cranks of the shaft S, andia difeforthe two middle cranks of the shaft S".

A description ofthe right hand die 35, as

A U-shaped stnaipu38--is secured in a recess the top of the die 35 and its depending arm are provided with circularhosses 391:0

which are pivoted links 40 which are slotted at 41 (Fig. 2) to receive studs 42, fixed in the actuating head 21. Links 43 (Fig. 8) are pivoted in slots 44 (Fig. 9) in the die blocks 35, being secured therein by cross pins 45. The upper ends of the links 43 are freely slidablc in guide blocks 46, also pivoted on the studs 42. Springs 47 are mounted on the links 43 between the lower headed ends of the links and the guide blocks 46. Stop screws 48 are provided for the links 40, to limit their downward swinging movement.

Each die block 35 (Fig. 8) is provided with a stud 50 in its upper face, which stud is grooved as indicated at 51, thus providing a head 52 for each stud. The heads 52 are projected through openings 53 (Fig.9) in a lock plate 54, slidable longitudinally. in a guideway 55 (Fig. 10) in the actuating head Each opening 53 is provided with a narrowed portion 56 (Fig. 9) adapted to re ceive the grooved portion of the stud 50 and to support the head 52 thereof above the plate 54. A tension spring 57 acts to draw the lock plate 54 yieldingly in locking position and a handle 58 (Fig. 1) is provided for moving the plate 54 in the oppositedirection to release the studs 50.

A latch 59 (Fig. is provided in the head 21, which engages a notch or shoulder 60 in the plate 54, when the latter is moved to releasing position. A spring 61 insures prompt downward movement of the latch to holding position. A pin or stud 62 projects downward from the latch and is engaged by a projecting portion of the base or of y the parts supported thereon, as the actuating head 21 reaches extreme downward position. Such engagement releases the locking plate 54, which will then be drawn to locking position by the spring 57. This movement of the plate 54 obviously will cause an engagement between the opening 53 and the grooved portion of thestud 50, as both the-head 21 and dies are in their lowermost position. a

The actuating head 21 is also provided with additional die blocks'64, 65, 66 and 67 (Fig. 1) which engage portions of the shaft S as the head reaches its lowest position and force all parts of the shaft to correct position, particularly preventing the shaft from yielding or springing upward in the holding dies. The blocks 65 and 66 are provided with depending portions 65* and 66 as shown in dotted lines in Fig. 1 and adapted to extend between the parts of the cranks which are held bythe lower dies and thus aid in preventing displacement, either axially or vertically.

7 Operation.

machine and I will now describe the operation thereof.

Assuming that the crank shaft has been placed in position between the holding dies 24 and and rests upon the blocks 22 and 23, the handle 58 (Fig. l) is then pulled outward, moving the lock plate 54 to releasing position. The several twisting (lie blocks then fall downward. by gravity,

but are guided in their falling movement by their links and'43.

The position of the blocks before release isshown in Fig. 3 and the position at the end of the falling movement is shown in Fig. 4. It will be seen that the rigid link 40 raises one end of each block 35, while the springpressed link 43 forces the other end of the block downward until the head 43 of the link 43 engages the guide block 46, which is rocked about the stud 4221s the die block moves downward.

Each die block is then positioned for engagement with the crank to be twisted thereby. The actuatinghead 21 is then moved downward, commonly'by hydraulic mechanism (not shown), and the cambars 26 thereupon act to yieldingly close the holding dies 24 and 25 onto the cranks which are not to be twisted. This movement takes place during the lost motion of the stud 42 in the slots 41 of thepositive links 40.

The links 40 thereafter act torock the die blocks 35 to the right or the left, as the case may be, twisting thecranks angularly until they engage the fixed die blocks or stops 31. (Fig. 7.) At the end of this twisting movement, the upper face of each die block has resumed its horizontal position and the headed studs have passed through the openings in the lock plate 54, which has been held in releasing position by the latch 59.

As the head 21 reaches its extreme downward limit of movement, the latch is pushed upward and the die blocks are all locked to the actuating head 21 which thereafter moves upward, carrying the die blocks 35 to the original position indicated in Fi At the extreme lower limit of travel, the die blocks 64, 65, 66, and 67 positively engage the crank shaft. bringing all parts thereof to the desired final position. It. will be understood that while the end die blocks are rocked in one direction, the middle block will be commonly rocked in the opposite direction but by exactly similar mechanism. It will'also be understood that the entire twisting operation is usually performed immediately after the forging of the crank shaft, and while the metal is still very hot and very soft.

It will be seen that my improved machine is very readily adapted to different sizes and shapes of crank shafts, as the holding dies 24 and 25 and the dieblocks 35 are all of simple construction and they maybe readily bearing, six throw, crank sha for which purpose it is particularly well adapted, but

it will be understood that it may also be adapted for various other combinations of throws and bearings,

Themachine 'is very rapid in operation and is particularly"desirable from the fact that thedies 351 are raised clear of the bed by the return of the actuating head 21, so

that there is ample clearance for inserting upper die. and automatic means to re-en-; gage said die withthe head after the twist-. ing operation thereof.

-7'. Acrank shaft twisting machine com-- prisinga lower holding die adapted to 1:e-. tain a crank shaft, an upper twisting die,

and removing crank shafts.

Hav ng thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed otherwise than as set forth in the clain1s,*b1.1t

that do claim is v V 1. A crankshaft twisting machine having in combination, a holding diefal twisting die, actuating mechanism by which said twist- .ing die is Supported". means to release saidtwisting die from, said actuating mechanism, means to guide said twisting die to engage the work, and means to rock said twisting die as said actuating mechanism descends.

2. A crankshaft twisting machine having, in combination, a holding die and a twisting die, actuating mechanism by which said twisting die is supported, meansto release said twisting die from said actuating mocha,

nism, means to guide said twisting die to engage the work, and means to re-engage said twisting die with said actuating mechanism before said actuating mechanism returns to raisedposition. Q

3. A crankshaft twisting machine having, in combination, aholding die andal twist ing die, actuating mechanism by which said twisting die is supported, means to release said twisting die from said. aetuatingmechanism, means to guide said twisting dieto engage the work, and means to. produce a rock ing movement of said twisting die in con tact with thework as said actuating mechanism descends and to thereafterraise said die with said actuatingmechanismi 4. A crankshafttwistingmachine having, in combination, a holding die and a twistin die, actuating mechanism by which said twisting die is supported. means to release said twisting die from said actuating mechanisn'nmeans to guide said twisting dieto engagethe work, means to lo'cksaid hold ing die on the work as the actuating mecha nism descends, and means to rock said-twisting die in contactwiththe work also as said actuatingmechanism descends:

5. A crankshaft twisting machine having, in combination, alowerholding dieand an upper twisting die, an actuating member by whieh said twisting'die is supported, meansto cause saidtwisting die to descend and engage the work before movement of said actuating member, andmeans torock' said twisting die in enga-geinent with the which said upper die is normally:held"inraised position, means by whichsaid die may be, manually released from said head.

thereby'to be positioned on said crank shaft,

means to actuate said head to operate said 8. In a crankshaft twisting machine, any

actuating head, a normally-"raised twisting die, means'to guide said die to lowered wor engaging position before said head descends, and means to returnsaid dieto raised' position as said head ascends.

9. Ina crankshaft twisting machine,an actuating head, a normally raised twisting die, meanstoguid'esaid die to lowered work= engaging position before said head descends, said die being manually releasable for downlot) ward movement to work-engaging position before said head? descends, means to. give said die an operative;twisting movement as said head descends, and means to retuinsaid die to normal raisedposition as said head ascends.

I 10. A crankshaft twisting machine com prising a lower die for holding a crank shaft and an upper die' coacting therewith for twisting said shaft, an actuating head for operating said upper die, and automatic means to lock said holding die on the work as said actuating head begins its operative movement and beforetwisting movement of said upper die. I V

11. A crankshaft twisting machine having, in combination, means to hold a flat forged crankshaft againstrotatiomwith the cranks disposed substantially in a vertical ing, in combination, aholding die, 2. normally raised twisting die, means to release said twisting die from itsraised position for movement by gravity to crank-engaging 7 position, and means to thereafter move said die angularly to twist said crankshaft.

13. A crankshafttwisting machine having, in combination, a holding die, a normally raised twisting die, means to release said twisting die from its raised position for movement by gravity to e 'ank-engaging position, and means to cause an angular idle movement of said twisting die in one direc tion during such movement by gravity and to thereafter causea reverse angular twisting movement of said crankshaft.

14. Acrankshaft twisting machine having, in combination. a separable holding die, a twisting die, adapted to partake of vertical and angular movements relative to said holding die and means to lock said holding die on the crankshaft between the vertical downward movement of the twisting die and the ensuing angular twisting movement thereof.

15. A crankshaft twisting machine having, in combination, a die for supporting a crank shaft against rotation, a normally raised die coaeting therewith for twisting said shaft, and means to give said twisting die a guided downward movement and an angular twisting movement successively.

16. A crankshafttwisting machine having, in combination, a die for supporting a crank shaft against rotation, a normally raised die coacting therewith for twisting said shaft, means to give said twisting die a guided downward movement and an angular twisting movement successively, and means to thereafter restore said twisting die to raised position.

17. A crankshaft twisting machine having, in combination, dies for supporting a crank shaft against rotatioma plurality of normally raised dies coacting therewith for twisting said shaft, an actuating member, and means to guide said twisting dies to crank-engaging position, said actuating membenbeing thereafter operated to give certain of said twisting dies an operative angular movement in one direction and certain other of said twisting dies an operative angular movement in a. reverse direction.

18. A crankshaft twisting machine having, in eombinatioma twisting die, a vertically movable actuating member, and a re taining device by which said twisting die is normally held in raised position by said actuating member, said retaining device being manually releasable before the crank twisting movement of said twisting die by said actuating member.

19. A crankshaft twisting machine having, in combination, a twisting die, a vertically movable actuating member, and a retaming device by which said twisting die is normally held in raised position by said actuating member, said retaining device being manually releasable before the crank twisting movement of said twisting die by said actuating member, and means to thereafter automatically restore said device to retaining relation with said die before the return movement of said actuating member.

20. A c'ankshaft twisting machine having, in combination, a holding die in which a flat forged crankshaft is supported with its cranks disposed substantially in a vertical plane, a normally raised twisting die, an actuating member, and operative connections between said actuating member and said twisting die, and means whereby the connections permit said twisting die to move downward while said'aetuating member remains in raised position and cause angular movement of said die during such downward movement.

21. The combination in a crankshaft twisting machine as set forth in claim 20, in which said actuating member causes a reverse angular twisting movement of said twisting die, subsequent to said first angular movement.

22. The combination in a crankshaft twisting machine as set forth in claim 20, in which said actuating member is effective through said connections to cause a reverse angular twisting movement of said twisting die as said member descends, subsequent to said first angular movement.

23. A crankshaft twisting machine having, in combination, means to, hold a flat forged crankshaft with the c 'anks disposed substantially in a vertical plane, an actuating head, and an upper twisting die connected by a yielding compressible link and by a lost-motion positive link to said head, said twisting die receiving a twisting movement through said links as said head descends.

24. In a crankshaft twisting machine, an upper crank twisting die, an actuating head by which said die is normally supported, a connection by which pressure from said head may be positively applied to said die when unsupported thereby, a yielding connection from said head to a different point on said die, and means to release said die from said head.

25. In a crankshaft twisting machine, an upper crank twisting die, an actuating head by which said die is nori'nally supported, a connection by which pressure from said head may be positively applied to said die when unsupported thereby, a yielding connection from said head to a different point on said die, and means to release said die from supporting connection with said head, while retaining both the positive and the yielding connections between said head and said die. A

26(In a crankshaft twisting machine, an upper crank twisting die, an actuating head by which said die is normally supported, a connection by which pressure from said head may be positively applied to said die when unsupported thereby, a yielding connection from said head to a different point on said die, and means to release said die from said head, said die being guided by said connec' tions in falling movement to engage the work when thus released. i i

27. In a crankshaft twisting machine, an upper crank twistingdie, an actuating head by which said die is normally supported, a connection by which pressure from saidhead may be positively applied to said die when from said holding die, and cam means op erable by said actuating member effective to lock said holding die against said crankshaft during the operation of said twisting die.

29. A crankshaft twisting machine hav ing, in combination, a holding diein which a flat forged crankshaft is supported with its cranks disposed substantially in a vertical plane, a twisting die, an actuating member for said twisting die movable toward and from said holding die, and a cam bar on said actuating member effective to lock said holding die against said crankshaft during the operation of said twisting die. Y

30. A crank shaft twisting machine having in combination a die for clamping a crank shaft against rotation, a normally raised die adapted to move relative to said clamping die for twisting said shaft, and means to give said twisting die a guided downward movement and an angular twist ing movement successively. I V

31. A crank shaft twisting machine, having in combination, means to hold a flat forged crank shaft against rotation, with the cranks disposed substantially in a vertical plane, an actuating head, and an upper twisting die, linkage pivoted to said head and pivoted to said die, thereby to pivotally connect said head and die, means to actuate said head, said linkage adapted to give a twisting movement to said die during actuation of said head.

32. A c 'ank shaft twisting machine, comprising a lower die for supporting a crank shaft against rotation, an upperdie adapted to coact therewith in twisting said shaft, an actuating head, a support for said upper die pivoted on said head, and means to rock said die relative to said support during actuation of said head. i

In testimony whereof I have hereunto affixed my signature.

MARK H. DAMERELL, 

